wifi: mac80211: bound S1G TIM PVB walk to the TIM element

ieee80211_s1g_check_tim() parses the S1G Partial Virtual Bitmap (PVB) of a
received TIM element. The TIM is handed in as the element payload:
ieee802_11_parse_elems_full() stores elems->tim = elem->data and
elems->tim_len = elem->datalen (net/mac80211/parse.c), so the valid bytes
are [tim, tim + tim_len).

When walking the encoded blocks the function passes the walker an end
sentinel of (const u8 *)tim + tim_len + 2, i.e. two bytes past the end of
the element. ieee80211_s1g_find_target_block() loops while (ptr + 1 <= end)
and dereferences ptr (and the per-mode ieee80211_s1g_len_*() helpers read
*ptr), so it can read up to two bytes beyond the TIM element -- an
out-of-bounds read of adjacent skb/heap data when the TIM is the last
element in the frame. The +2 appears to account for the element id/len
header, but tim already points past that header at the element payload, so
the addend is wrong.

Pass the correct element end, (const u8 *)tim + tim_len.

Fixes: e0c47c6229c2 ("wifi: mac80211: support parsing S1G TIM PVB")
Signed-off-by: Bryam Vargas <hexlabsecurity@proton.me>
Link: https://patch.msgid.link/20260606074341.49135-1-hexlabsecurity@proton.me
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/linux/ieee80211-s1g.h b/include/linux/ieee80211-s1g.h
index 22dde4cbc1b0..3f9626ad3d97 100644
--- a/include/linux/ieee80211-s1g.h
+++ b/include/linux/ieee80211-s1g.h
@@ -556,7 +556,7 @@ static inline bool ieee80211_s1g_check_tim(const struct ieee80211_tim_ie *tim,
 	 */
 	err = ieee80211_s1g_find_target_block(&enc_blk, &target_aid,
 					      tim->virtual_map,
-					      (const u8 *)tim + tim_len + 2);
+					      (const u8 *)tim + tim_len);
 	if (err)
 		return false;